Kensington Watches
Seiko Prospex SPB117J1 Alpinist Automatic Bracelet Watch - W25416

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Seiko

Seiko Prospex SPB117J1 Alpinist Automatic Bracelet Watch - W25416

Ref. SPB117J1

Among our 168 Seiko watchesThis watch£690
Premium

Sits in Seiko’s upper tier here — more premium than three quarters of the Seiko watches we list, which start at £110.

Price range £110 to £3,550 across 168 Seiko watches in stock.

The Alpinist line began in 1959 as a watch built specifically for Japanese mountain climbers — people who needed a reliable instrument in conditions where most watches would fail. That original brief still shapes this version: the rotating inner compass ring, operated by a second crown at four o'clock, is a functional carry-over from those early models, not a design gesture. The shark-tooth hour markers — triangular indices that read immediately in a glance — give the black dial its character and its nickname. At 39.5mm with a 46.4mm lug-to-lug, it sits proportionately well on a range of wrists without pushing into sports-watch territory on the cuff. The 6R35 movement runs to approximately 70 hours on a full wind, which means a watch left on the nightstand Friday evening will still be running Monday morning. The screw-down crown and transparent caseback together reward the owner who likes to see what is inside — the movement is worth looking at.

Reference
SPB117J1
Brand
Seiko
Collection
Prospex
Case size
39.5mm
Case thickness
13.2mm
Lug width
20mm
Case material
Stainless steel
Dial
Black
Crystal
Sapphire
Movement
Automatic
Calibre
6R35
Functions
Date, Compass
Water resistance
200m
Bracelet / strap
Stainless steel bracelet
Strap colour
Silver
Clasp
Three-fold clasp
Lume
LumiBrite
Retailer
F.Hinds
Additional specifications
Lug-to-lug
46.4mm
Power reserve
70 hours
Learn more about Seiko

Kintaro Hattori opened a watch and clock shop in Tokyo in 1881, aged twenty-one, and began manufacturing under the name Seikosha — roughly, house of exquisite workmanship — in 1892. The Seiko name appeared on watches from 1924.

The company's significance is that it broke the Swiss monopoly twice. First on precision: Seiko was appointed official timekeeper of the 1964 Tokyo Olympics and built the quartz chronometers and printing timers to do it, and in the 1960s its movements placed highly at the Neuchâtel and Geneva observatory trials against the best Swiss houses.

Then on technology. On Christmas Day 1969 Seiko released the Astron, the world's first quartz wristwatch, accurate to five seconds a month where mechanical watches managed that per day. The consequences for Switzerland were catastrophic — employment in the Swiss industry fell by roughly two-thirds over the following decade. Seiko deliberately did not enforce its quartz patents, allowing the technology to spread.

The same year it produced the 6139, among the first automatic chronographs, and it has since introduced Kinetic, Spring Drive — a hybrid regulating a mechanical mainspring electronically, giving a perfectly gliding seconds hand — and its own dive and field lines.

Seiko remains fully vertically integrated, making its own hairsprings, quartz crystals, and even the Zaratsu-polished cases, at price points from under a hundred pounds upward.

1881
Kintaro Hattori opens his Tokyo shop.
1924
The first watches carry the Seiko name.
1964
Official timekeeper of the Tokyo Olympics.
1969
The Astron becomes the first quartz wristwatch.
1999
Spring Drive enters production.

All Seiko watches

Also in 6 collections

This watch appears in the Seiko Prospex range (32), Back in Stock (3,988), Stainless Steel Watches (2,814), Automatic Watches (1,546), Sports Watches (700) and Dive Watches (494).

Temporarily out of stock

F.Hinds is not currently taking orders for this reference. Last listed as available on 28 September 2026. Stock is checked nightly and this page updates when it returns.

Out of stock

What the specifications mean

A mechanical watch built to be worn hard and got wet.

Strengths

  • 200m water resistance, rated for actual diving
  • 39.5mm suits most wrists
  • 46.4mm lug-to-lug keeps the 39.5mm case wearable
  • Sapphire crystal, which resists scratching
  • 70-hour reserve survives a weekend off the wrist
Best forDivingSwimmingEveryday wear

Seiko Prospex SPB117J1 Alpinist alternatives

Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.

Prospex SPB117J1 Alpinist Automatic Bracelet Watch - W25416 compared with 2 alternatives from other brands
SpecificationThis watchProspex SPB117J1 Alpinist Automatic Bracelet Watch - W25416SPB117J1CertinaDS Action Day-Date Powermatic 80 41mm Mens WatchC0324301604100BulovaArchive Series 98A324 MIL-SHIPS Green Watch - Special Edition - W0937398A324
Price£690£695£599
Case size39.5mm41mm41mm
Water resistance200m200m200m
MovementAutomaticAutomaticAutomatic
StrapStainless steel braceletLeather strapFabric strap
Power reserve70 hours80 hours60 hours
This watch
  • Wears larger
  • Costs less
  • Wears larger

Your new watch

Frequently asked questions, and things you should know about this watch

Can I swim with it?

Yes. At 200m it is rated for swimming, snorkelling and recreational diving.

Water resistance explained

Will the glass scratch?

Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.

Sapphire, mineral and acrylic compared

Does it need a battery?

No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.

Quartz, automatic and solar compared

How long does it run for when it's not worn?

About 70 hours fully wound — enough to sit off the wrist over a weekend and still be running.

What size strap does it take?

20mm. Any strap of that width will fit, and on most modern watches quick-release bars make the swap a two-minute job with no tools.

Will it fit my wrist?

Lug-to-lug is 46.4mm, which suits wrists from roughly 16cm (6¼ inches) upward.

Lug-to-lug decides fit more than case diameter does.

How to size a watch to your wrist

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